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METRO ROLLING STOCK (TRAIN)
NOISE PERIODIC TEST PROCEDURE
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System/Equipment Train
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Amendment Record
RevNo
AmendedDate
AmendedBy
Section/pageAmended
Amended details
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1. Title
Routine/Periodic test procure of Noise Test.
2. Purpose of Test Procedure
The Test procedure for measurement of exterior noise of Rolling Stock, when in standstill and during
motion of vehicle, Noise monitoring test shall be conducted after an interval of time or after modification
of Rolling stock.
The objective of the test is to check and confirm acoustic comfort level as per ISO 3095 and as per The
Noise Pollution Rules, 2000.
3. Reference Documents
ISO 3095: Railway ApplicationsAcousticsMeasurement of Noise emitted by Rail bound vehicles.
The Noise Pollution (Regulation and Control) Rules, 2000. Ministry of Environment & Forests.
IEC 61672-1: ElectroacousticsSound level meters
FTANoise and Vibration Manual
4. Definitions & Abbreviations
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4.1.6. A-weighted equivalent continuous sound pressure level:Equivalent (average) sound pressure level in dB for a period of time.
LpAeq.T : A-weighted equivalent continuous sound pressure level in dBpA(t) : RMS A-weighted sound pressure in Pa
po : Reference sound pressure; po= 20 PaT : Time interval in sec.
4.1.7. A-weighted equivalent continuous sound pressure level:Equivalent (average) sound pressure level in dB for a period of time.
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8.Procedure: Measurement of Exterior Noise
Vehicle (Train) noise is measured in following types to check and confirm the acoustic noise level
limit, when the Train is at stationary and running.
1. Noise level measurement of Stationary Train
2. Noise level measurement of Running Train at constant speed.
3. Environmental Noise measurement and Noise impact analysis.
8.1 Noise level measurement of stationary Train.
8.1.1 Measurement position:
For stationary Train, the measurement points as shown below. Each car Noise ismeasured from center of the car, 7.5 meter from tract center line and 1.2 meter above
the track.
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8.1.4 Back ground sound pressure level
For monitoring test Difference ofA-Weighted sound pressure levelshall be at least
5dB above.
If the difference in sound level is less than 10dB the reading obtained shall becorrected as per below table.
Difference of A-Weighted sound pressurelevel dB
Correction to be added to A-Weighted sound
pressure level obtained from the vehicle inpresence of back ground noise dB.
> 10 0
6 to 9 -1
5 -2
8.1.5 Test Procedure Microphone should be placed in exterior at the center of the car, 7.5m from track
center and 1.2m above the rail top. Measurement period shall be T=20sec as per ISO
3095 Th i ti i t l b d d t 5 b t it h ld b j tifi d i
Difference of A-Weighted
sound pressure level
Noise measured from the vehicle
in presence of back ground noiseA-weighted back ground sound
pressure alone= -
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Measuring point DT-1 M-1 M-2 DT-2
1st
2 nd
3rd
Average
8.2 Noise level measurement of Running Train at constant speed
8.2.1 Measurement position: Microphone should be placed 7.5 meter from tract center line and 1.2 meter above
the track.
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8.2.4 Back ground sound pressure level
For monitoring test Difference of A-Weighted sound pressure level shall be at least
5dB above.
If the difference in sound level is less than 10dB the reading obtained shall becorrected as per below table.
Difference of A-Weighted sound pressure
level dB
Correction to be added to A-Weighted sound
pressure level obtained from the vehicle in
presence of back ground noise dB.> 10 0
6 to 9 -1
5 -2
8.2.5 Test Procedure Over the measurement section of the track, the train should run at the chosen constant
speed or at maximum speed 80kmph, the speed should be stabilized within 5%.
The measurement time interval T will begin, when the front of the train is passing the
i h d ill d h f th hi l i l i ( i ) th
Difference of A-Weighted
sound pressure level
Noise measured from the vehicle
in presence of back ground noiseA-weighted back ground sound
pressure alone= -
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Record sheet:
Measuring
point
Train Speed Measured value in
dB
Ambient/
Acoustic noise
Remarks
1st
2 nd
3rd
4th
5th
6th
Average
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8.3 Assessment of Transit Noise Impact on Environmental Noise Level:
Assessment of Metro Trains Noise impact on Noise sensitive location such as Residential
Building, Schools and Hospitals, around Metro viaduct shall be measured and analyzed.
Detail Noise Assessment Test:
1. Screening Procedure.2. General Noise Assessment.3. Detail Noise Analysis.
3.1. Measurement of Noise Exposure level of Metro Trains3.2. Measurement of Existing Noise Exposure level.3.3. Analysis of Measurements and Noise Impact Criteria.
3.3.1. Ldn Calculation of Metro Trains.3.3.2. Project Noise vs. Distance exposure curve.
3.4. Analysis of Noise impact on nearby location and for Mitigation.3.5. Procedure to measure Project Noise and Environmental using NTi
Audio meter3.6. Project Noise and Environmental Noise Record Sheet.
1. Screening Procedure:
The noise screening procedure is to identify location, where a project may cause noise impact. For
i ll i i i l d id d b i i l
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3.2. Measurement of Existing Noise Exposure level.
Measurement of existing noise on nearby location, where the project noise has been measured.
Existing noise shall me measured for a whole day or an hour measurement, depends on the locationand environment.
Recommended Microphone position to Measure Existing Noise:
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Option -1:
Measure full day noise exposure level Ldn. If the location is exposed with high external noise
sources and accurate/actual Existing noise.Measurement shall be taken generally between Noon Monday and Noon Friday.
Option -2:
Measure hourly Leq of three Hours and compute Ldn with three hourly Leq. The measurement is
preferable, if the location is exposed to moderate impact. The obtained Ldn will be slightly
underestimated, for accurate Existing Noise measurer full day Ldn.
Three Measurement will be taken during peak hours, midday and late night to early morning.
Option -3:
Ldn can be obtained with only LeqA one hour existing noise measurement, Ldn obtained will be
moderately underestimated.
Measurement between 7 am to 7 pm : Ldn Leq 2 Measurement between 7 am to 10 pm : Ldn Leq + 3 Measurement between 10pm to 7 am : Ldn Leq + 8
3.3. Analysis of Measurements and Noise Impact Criteria
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3.3.2. Project Noise vs. Distance exposure curve.
Estimation of project noise exposure at other distance on the receiver interest . The project noisevs. distance exposure curvewill cover project impact Ldn and Leq from 50 feet to 1000 meter.
DDistance 50 feet to 1000 feet.
GGround Factor.
Calculation of Ground factor:
Ldn or Leq
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3.4. Analysis of Noise impact on nearby location and for Mitigation.
Project Noise exposure and Existing noise exposure were obtained and Noise level impact around thelocation can be identified with Project Noise vs. Distance exposure curve.
Noise Impact Criteria: Reference FTA manual Section 3.1
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Example of Noise impact analysis on nearby location:
Project Noise: Ldn at 50 feet : 65 dBExisting Noise Ldn : 62 dB
Receiver interest : 1.2 Meter (3.937 feet) from Rail Top.
Ground factor (G) : 0.63
Location : Residential Buildings
Project Noise vs. Distance exposure curve:
Ldn or Leq
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Noise Mitigation:
Noise mitigation is to minimize noise pollution and noise impact on the environment.Mitigation as strongly recommended, if the Ldnof Project Noise is more than 65 dB.
As per The Noise pollution (Regulation and Control) Rules, 2000, ambient noise shouldbe less then below mentioned value.
Category of Area / Zone
Limits in dB (A) Leq
Day Time Night Time
Industrial Area 75 70
Commercial Area 65 55
Residential Area 55 45
Silence Zone 50 40
Note:
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Selection of Noise sensitive site
Measurement of Noise exposure levelSEL of Metro Train at 50 feet from
Viaduct center.
Convert Measure SEL of Metro Trainsinto SEL Reference.
Calculate Ldn or Leq (H) with SELreference and operation Characteristics
of Metro Trains.
Calculate Ldn or Leq (H) with SELf d ti
1. Existing Noise Exposure Leq (H)for
nonresidential area during Noon hours of thealternative week days.
2. Measurement of Existing Noise exposure levelin Residential area. Full day measurement ofLdn will results exact value of existing noise.Option -1:Measure full day noise exposure level Ldn. If thelocation is exposed with high external noise sources.Measurement shall be taken generally between NoonMonday and Noon Friday.Option -2:Measure hourly Leq of three Hours and compute Ldnwith three hourly Leq. The obtained Ldn will be slightlyunderestimated.
Th M t ill b t k d i k h
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3.5. Procedure to measure Project Noise and Environmental using NTiAudio meter:
NtiXL2 audio and acoustic analyzer:
XL2 is an advanced integrating sound level meter designed according to IEC 61672. XL2 is designed to measure sound level of Audio Acoustic installation (eg: Cinemas), Noise
measurement (eg: Live events, environmental noise), live sound (eg:PA), Broadcast, building
acoustics, industrial quality control and aerospace.
Refer XL2 operational manual to operate the device and to measure sound level.
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Environmental Noise Test Location, Project Noise Measurement and Existing Noise Measurement Record Sheet
Horizontal Distance of Noise level Meter /
Microphone placed from the center of track15.2 Meter
Microphone
Vertical height from
Rail Top.
App 1.5
Meter
Temperature:
DateHumidity:
Project Noise Measurement Existing Noise Measurement
Location: Location:
First Measurement
Train Set
Passing
Actual Time Measured
Leq or SELRemarks Start Time
Ldn Measured
Remarks
Approaching 50m,
Microphone
Leaving 50m,
Microphone
End Time
Second Measurement
Start Time
Ldn Measured
Remarks
End Time
Third MeasurementStart Time
Ldn Measured
Remarks
End Time